The jar was part of a conceptual art project by Beijing artist Liang Kegang, who had returned from a trip in southern France. Liang put the jar on auction before a group of about 100 Chinese artists and collectors last month, reports the Associated Press.

"Air should be the most valueless commodity, free to breathe for any vagrant or beggar," Liang said in an interview with the AP. "This is my way to question China's foul air and express my dissatisfaction."